var xmlHttp_subject_check = createXmlHttpRequestObject();//web主機時間AJAX
function createXmlHttpRequestObject()
{
	var xmlHttp_subject_check;
	try
	{
		xmlHttp_subject_check = new XMLHttpRequest();
	}
	catch(e)
	{
		var XmlHttpVersions_subject_check = new Array('MSXML2.XMLHTTP.6.0',
										'MSXML2.XMLHTTP.5.0',
										'MSXML2.XMLHTTP.4.0',
										'MSXML2.XMLHTTP.3.0',
										'MSXML2.XMLHTTP',
										'Microsoft.XMLHTTP'
										)
		for(var i=0; i<XmlHttpVersions_subject_check.length && !xmlHttp_subject_check; i++)
		{
			try
			{
				xmlHttp_subject_check = new ActiveXObject(XmlHttpVersions_subject_check[i]);
			}
			catch(e){}
		}
	}

	if(!xmlHttp_subject_check)
		alear("Error creating the XMLHttpRequest object.");
	else
		return xmlHttp_subject_check;
}

function process_subject_check(var1)
{
	if(xmlHttp_subject_check.readyState == 4 || xmlHttp_subject_check.readyState == 0)
	{
		xmlHttp_subject_check.open("GET", "http://www.siptwnt.com/include/subject.php?subject=" + var1, true);
		/*
		onreadystatechang : 每個狀態改變時都會觸發這個事件處理器，通常會呼叫一個JavaScript函式
		*/
		xmlHttp_subject_check.onreadystatechange = handleServerResponse_subject_check;
		xmlHttp_subject_check.send(null);
	}	
}

function handleServerResponse_subject_check()
{
	/*
	readyState : 0未初始化、1正在載入、2已載入、3 互動中、4完成
	*/
	if(xmlHttp_subject_check.readyState == 4)
	{
		if(xmlHttp_subject_check.status == 200)
		{
				helloMessage = xmlHttp_subject_check.responseText;
				document.getElementById("subject").innerHTML = helloMessage;
		}
		else
		{
			alert("There was a problem accessing the server: " + xmlHttp_subject_check.statusText);
		}
	}
}